US8693362B2 - Power headroom reporting - Google Patents

Power headroom reporting Download PDF

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Publication number
US8693362B2
US8693362B2 US13/079,724 US201113079724A US8693362B2 US 8693362 B2 US8693362 B2 US 8693362B2 US 201113079724 A US201113079724 A US 201113079724A US 8693362 B2 US8693362 B2 US 8693362B2
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Prior art keywords
channel
power
transmit
mobile device
transmit power
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US13/079,724
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US20120082041A1 (en
Inventor
Aleksandar Damnjanovic
Jelena M. Damnjanovic
Juan Montojo
Peter Gaal
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Qualcomm Inc
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Qualcomm Inc
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Priority to US13/079,724 priority Critical patent/US8693362B2/en
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to KR1020127029010A priority patent/KR101573792B1/ko
Priority to EP11717810A priority patent/EP2556705A1/en
Priority to CN201180017360.7A priority patent/CN102823307B/zh
Priority to PCT/US2011/031306 priority patent/WO2011127097A1/en
Priority to JP2013503859A priority patent/JP5507755B2/ja
Priority to BR112012025180-5A priority patent/BR112012025180B1/pt
Priority to TW100111868A priority patent/TWI466565B/zh
Assigned to QUALCOMM INCORPORATED reassignment QUALCOMM INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MONTOJO, JUAN, DAMNJANOVIC, ALEKSANDAR, DAMNJANOVIC, JELENA M., GAAL, PETER
Publication of US20120082041A1 publication Critical patent/US20120082041A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets

Definitions

  • Wireless communication systems are widely deployed to provide various types of communication content such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., bandwidth and transmit power). Examples of such multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, and orthogonal frequency division multiple access (OFDMA) systems.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • OFDMA orthogonal frequency division multiple access
  • a wireless multiple-access communication system can simultaneously support communication for multiple wireless terminals.
  • Each terminal communicates with one or more base stations via transmissions on the forward and reverse links.
  • the forward link (or downlink) refers to the communication link from the base stations to the terminals
  • the reverse link (or uplink) refers to the communication link from the terminals to the base stations.
  • This communication link may be established via a single-input single-output (SISO), multiple-input single-output (MISO) or a multiple-input multiple-output (MIMO) system.
  • SISO single-input single-output
  • MISO multiple-input single-output
  • MIMO multiple-input multiple-output
  • terminals may be power controlled by base stations subject to a maximum power limit.
  • novel functionality for transmitting a PHR from a mobile device.
  • the mobile device may identify a transmit power associated with each of a number of independently power controlled channels on one or more configured carriers. There may be a one channel that is an uplink control channel, and one or more additional channels that are uplink shared channels.
  • the identified transmit power of one channel (e.g., the uplink control channel) may be a virtual transmit power, while other identified transmit powers may be measured transmit powers for actual transmissions.
  • the identified transmit powers may be accumulated, and the power headroom available for the mobile device may be calculated using the accumulated transmit powers.
  • the mobile device may transmit a power headroom report to a base station.
  • a method of reporting power headroom from a mobile device may comprise: identifying a transmit power associated with each of a plurality of independently power controlled channels on which the mobile device is configured to transmit concurrently; accumulating the identified transmit powers; calculating a power headroom available for the mobile device using the accumulated transmit powers; and transmitting a headroom report comprising the calculated power headroom available for the mobile device.
  • a first channel may be an uplink control channel and a second channel may be an uplink shared channel.
  • the identified transmit power of the first channel may be a virtual transmit power
  • the identified transmit power of the second channel may be a determined transmit power for an actual transmission.
  • the first channel may be a physical uplink control channel (PUCCH); the second channel may be a physical uplink shared channel (PUSCH); and the PUCCH and PUSCH may be transmitted concurrently on different carriers.
  • the identified transmit power of one or more of the plurality of independently power controlled channels may be virtual transmit power.
  • the virtual transmit power may be determined by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • a transmit power may be determined during a first time period for a first independently power controlled channel to identify a first transmit power; and a virtual transmit power may be attributed to a second independently power controlled channel to identify a second transmit power, wherein the mobile device does not transmit on the second independently power controlled channel during the first time period.
  • Each of the plurality of independently power controlled channels may be transmitted on a different carrier of a multi-carrier system.
  • the plurality of independently power controlled channels may be allocated to a single carrier.
  • a device for reporting power headroom may comprise: a measurement module configured to identify a transmit power associated with each of a plurality of independently power controlled channels on which a mobile device is configured to transmit concurrently; a power headroom calculation module configured to sum the identified transmit powers, and calculate a power headroom available for the mobile device using the summed transmit powers; and a transmitter configured to transmit a headroom report comprising the calculated power headroom available for the mobile device.
  • first channel may be an uplink control channel and a second channel may be an uplink shared channel.
  • the identified transmit power of the first channel may be a virtual transmit power
  • the identified transmit power of the second channel may be a determined transmit power for an actual transmission.
  • the first channel may be a physical uplink control channel (PUCCH); the second channel may be a physical uplink shared channel (PUSCH); and the PUCCH and PUSCH may be transmitted concurrently on different carriers.
  • the identified transmit power of one or more of the plurality of independently power controlled channels may be virtual transmit power.
  • the power headroom calculation module of the device may be further configured to determine the virtual transmit power by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • the measurement module of the device may be configured to determine transmit power during a first time period for a first independently power controlled channel to identify a first transmit power; and attribute a virtual transmit power to a second independently power controlled channel to identify a second transmit power, wherein the mobile device does not transmit on the second independently power controlled channel during the first time period.
  • Each of the plurality of independently power controlled channels of the device may be transmitted on a different uplink carrier of a multi-carrier system.
  • the plurality of independently power controlled channels of the device may be allocated to a single uplink carrier.
  • the device may be a processor.
  • the device may a mobile device.
  • the mobile device may be a user equipment in a long term evolution-advanced system.
  • a computer program product for reporting power headroom from a mobile device may include a non-transitory computer-readable medium that may comprise: code for identifying a transmit power associated with each of a plurality of independently power controlled channels on which the mobile device is configured to transmit concurrently; code for accumulating the identified transmit powers; code for calculating a power headroom available for the mobile device using the accumulated transmit powers; and code for transmitting a headroom report comprising the calculated power headroom available for the mobile device.
  • a system for reporting power headroom from a mobile device may comprise means for identifying a transmit power associated with each of a plurality of independently power controlled channels on which the mobile device is configured to transmit concurrently; means for accumulating the identified transmit powers; means for calculating a power headroom available for the mobile device using the accumulated transmit powers; and means for transmitting a headroom report comprising the calculated power headroom available for the mobile device.
  • a first channel may be an uplink control channel and a second channel may be an uplink shared channel.
  • the identified transmit power of the first channel may be a virtual transmit power
  • the identified transmit power of the second channel may be a determined transmit power for an actual transmission.
  • the first channel may be a physical uplink control channel (PUCCH); the second channel may be a physical uplink shared channel (PUSCH); and the PUCCH and PUSCH may be transmitted concurrently on different carriers.
  • the identified transmit power of one or more of the plurality of independently power controlled channels of the system may be a virtual transmit power.
  • the virtual transmit power of the system may be determined by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • Each of the plurality of independently power controlled channels of the system may be transmitted on a different carrier of a multi-carrier system.
  • the plurality of independently power controlled channels of the system may be allocated to a single carrier.
  • a method of receiving a power headroom report from a mobile device comprises: receiving a headroom report including a power headroom available for uplink transmissions from a mobile device, the power headroom report identifying an accumulated transmit power associated with a plurality of independently power controlled channels on which the mobile device is configured to transmit concurrently; and scheduling an uplink allocation in relation to the plurality of independently power controlled channels as a group based on information obtained from the power headroom report.
  • a first channel may be an uplink control channel and a second channel may be an uplink shared channel.
  • the identified transmit power of the first channel may be a virtual transmit power
  • the identified transmit power of the second channel may be a determined transmit power for an actual transmission.
  • the first channel may be a physical uplink control channel (PUCCH); the second channel may be a physical uplink shared channel (PUSCH); and the PUCCH and PUSCH may be transmitted concurrently on different carriers.
  • the identified transmit power of one or more of the plurality of independently power controlled channels may be virtual transmit power.
  • the virtual transmit power may be determined by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • the identified transmit power of one or more of the plurality of independently power controlled channels may be virtual transmit power.
  • the power headroom calculation module of the device may be further configured to determine the virtual transmit power by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • the scheduling may include scheduling an uplink allocation for a first channel comprising an uplink control channel; and scheduling an uplink allocation for a second channel comprising an uplink shared channel.
  • the allocation for the second channel of the method may vary over time to account for whether the first channel has a scheduled allocation.
  • Each of the plurality of independently power controlled channels of the method may be transmitted on a different uplink carrier of a multi-carrier system.
  • the plurality of independently power controlled channels of the method may be allocated to a single uplink carrier.
  • a device for receiving a power headroom report from a mobile device may comprise: a receiver configured to receive a headroom report that may comprise a power headroom available for uplink transmissions from a mobile device, the power headroom report identifying an accumulated transmit power associated with a plurality of independently power controlled channels on which the mobile device may be configured to transmit concurrently; and an allocation module configured to schedule an uplink allocation in relation to the plurality of independently power controlled channels as a group based on information obtained from the power headroom report.
  • a first channel may be an uplink control channel and a second channel may be an uplink shared channel.
  • the identified transmit power of the first channel may be a virtual transmit power
  • the identified transmit power of the second channel may be a determined transmit power for an actual transmission.
  • the virtual transmit power of the device may be determined by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • Each of the plurality of independently power controlled channels of the device may be transmitted on a different uplink carrier of a multi-carrier system; or the plurality of independently power controlled channels of the device may be allocated to a single uplink carrier.
  • the device may be a processor.
  • the device may be an eNodeB in a long term evolution-advanced (LTE/A) system.
  • FIG. 1 is a block diagram of a wireless communication system
  • FIG. 2 is a block diagram of a transmitter and receiver in a multiple input multiple output (MIMO) system
  • FIG. 3 is a block diagram of a power headroom report module
  • FIG. 4A is a block diagram of an alternative architecture for a power headroom report device
  • FIG. 4B is a bar graph illustrating an example power headroom calculation
  • FIG. 5 is a block diagram of a scheduler
  • FIG. 6 is a flowchart of a method for power headroom calculation from a mobile device
  • FIG. 7 is a flowchart of a method for power headroom calculation for uplink shared and control channels from a mobile device
  • FIG. 8 is a flowchart of a method for power headroom calculation for uplink shared and control channels in an LTE system.
  • FIG. 9 is a flowchart of a method for scheduling one or more grants.
  • a mobile device may identify a virtual transmit power associated uplink control channel, and an actual transmit power for one or more uplink shared channels.
  • the virtual transmit power may be an uplink control channel offset, and be used when the uplink control channel is not transmitting.
  • the identified transmit powers may be added up, and the power headroom available for the mobile device may be calculated using the summed transmit powers.
  • the mobile device may transmit a power headroom report to a base station.
  • various embodiments may omit, substitute, or add various procedures or components as appropriate.
  • the methods may be performed in an order different than that described, and that various steps may be added, omitted or combined.
  • aspects and elements described with respect to certain embodiments may be combined in various other embodiments.
  • the following systems, methods, devices, and software may individually or collectively be components of a larger system, wherein other procedures may take precedence over or otherwise modify their application.
  • a base station 105 may include multiple antenna groups (not shown), and there may be multiple antennas in each antenna group. Each group of antennas and/or the area in which they are designed to communicate may be referred to as a sector. Antenna groups each may be designed to communicate with mobile devices 110 in a sector of the areas covered by the base station 105 .
  • the base station 105 may be an eNode B in an LTE system, although aspects of the invention may be applicable to any number of other types of systems.
  • a mobile device 110 is in communication with one of the antenna groups of base station 105 . There may be multiple other mobile devices (not shown) in communications with the base station, as well.
  • the base station 105 may transmit information over downlink 115 and receive information from a mobile device 110 over uplink 120 .
  • Each of the downlink 115 and uplink 110 may include a plurality of component carriers which have been configured for use by the mobile device 110 .
  • the mobile device 110 may be user equipment (UE) in an LTE/A system.
  • the mobile device 110 may be a personal computer, laptop, tablet, personal digital assistant (PDA), thin client, smartphone, cellular telephone, or any other mobile computing device.
  • PDA personal digital assistant
  • the mobile device 110 may transmit a power headroom report (PHR) to the base station 105 .
  • PHR power headroom report
  • This report may include information identifying a difference between a maximum mobile device transmit power and a calculated mobile device transmit power (e.g., according to the current grant).
  • PHRs can be transmitted periodically, or when the downlink pathloss changes in an amount exceeding a threshold and may relate to a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), or both channels.
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the base station 105 can send up or down commands for either PUCCH or PUSCH.
  • the mobile device 110 may be configured to identify a transmit power associated with each of a number of independently power controlled uplink channels.
  • the independently power controlled uplink channels may relate to concurrent transmissions on a single carrier and/or to transmissions on a plurality of uplink carriers configured for use by the mobile device 110 .
  • the mobile device 110 may add up the identified transmit powers for a given time period, and use this to calculate a power headroom available for the mobile device 110 .
  • a power headroom report may be transmitted (e.g., in a single protocol data unit (PDU)) over the reverse link 115 , and may include the calculated power headroom and/or an indication of the power headroom available for the mobile device 110 .
  • PDU protocol data unit
  • the independently power controlled uplink channels may include an uplink control channel, and one or more uplink shared channels.
  • the identified transmit power of the control channel may be a virtual transmit power (e.g., a representation of transmit power which will be used in the event of a transmission when the control channel is not transmitting). This virtual transmit power may be an offset value and, in some scenarios, may be determined by disregarding contributions associated with various channels and/or transmission formats such as values of ⁇ _TF used with an LTE communication system.
  • the identified transmit power of the uplink shared channel may be a measured transmit power for an actual transmission.
  • Each of the independently power controlled channels may be transmitted during a same time period on a different carrier of a multi-carrier system. However, in other examples, the independently power controlled channels may be transmitted concurrently on a single carrier.
  • aspects may be used within a long term evolution-advanced (LTE/A) system.
  • LTE/A may utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDMA) on the uplink.
  • OFDM and SC-FDMA partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, or the like.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDMA.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • K may be equal to 128, 256, 512, 1024 or 2048 for a corresponding system bandwidth of 1.25, 2.5, 5, 10 or 20 megahertz (MHz), respectively.
  • the system bandwidth may also be partitioned into sub-bands.
  • a sub-band may cover 1.08 MHz, and there may be 1, 2, 4, 8 or 16 sub-bands for a corresponding system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • the mobile device 110 will be referred to as a UE 110 , and the base station 105 referred to as eNode B 105 .
  • the independently power controlled uplink channels may include a physical uplink control channel (PUCCH), and one or more physical uplink shared channels (PUSCH).
  • PUCCH and PUSCH may be transmitted concurrently.
  • a UE 110 may be configured to make concurrent PUCCH and PUSCH transmissions, with different PUCCH and PUSCH transmissions on multiple carriers.
  • a mobile device 110 may be configured for multi-carrier operation with PUCCHs transmitted on multiple uplink carriers.
  • a UE 110 may generate a PHR for multiple independently power controlled channels transmitted in parallel (e.g., the capability to transmit PUCCH and PUSCH concurrently in an LTE/A system, or to transmit on a plurality of PUSCHs corresponding to a plurality of carriers configured for use by the UE 110 ).
  • the multiple independently power controlled channels may include channels corresponding to a plurality of component carriers.
  • multiple independently power controlled channels may be transmitted on a single carrier for which the UE 110 transmits both PUCCH and PUSCH during a given time period.
  • a single PHR may carry information about both PUCCH and PUSCH for a set of carriers utilized by UE 110 .
  • the power headroom value may include a PUCCH contribution and a PUSCH contribution.
  • the power headroom value in a PHR may include a single, 6 bit PDU, with a reporting range from ⁇ 23 dB to 40 dB (and steps of 1 dB).
  • a PUCCH contribution may be signaled in a PHR with a virtual transmit power (e.g., a standardized offset or an offset that ignores variations due to different transmit formats).
  • these contributions may be signaled as a standardized ratio between PUSCH and PUCCH when PUCCH is inactive.
  • a UE 110 may transmit a PHR to the eNode B 105 when triggered by the eNode B 105 , or periodically.
  • a PHR may be generated for PUSCH transmissions at a time when there is no corresponding PUCCH transmission. In that case, notwithstanding that there are several PUCCH formats which could influence the PUCCH contribution, the differences may be ignored by assuming a particular format for a virtual PUCCH transmission.
  • the virtual transmit power may, therefore, be determined by disregarding a variation associated with uplink control channel transmission in calculating the power headroom.
  • the virtual transmission concept may be extended to virtual PUSCH transmissions in the multi-carrier context.
  • a PHR may be generated at a time when there is no PUSCH or PUCCH transmission, and in this case a virtual transmit power may be used for both PUSCH and PUCCH.
  • the UE 110 may reduce the number of PHR bits that are transmitted when PUCCH is not transmitted. However, based on the ratio or offset, the eNode B 105 may infer a PUCCH contribution when scheduling.
  • a single PHR may provide the eNode B 105 with information on both PUCCH and PUSCH.
  • the eNode B 105 may decompose the PHR into information about PUSCH and information about PUCCH.
  • the eNode B 105 may use this information to influence future scheduling decisions. For example, the eNode B 105 may know that ACK/NAK is expected in a particular subframe (e.g., i+4). Given a power headroom reported for subframe (i), and the knowledge that the UE 110 will need to allocate more power for ACK/NAK, the eNode B 105 may change its uplink grants for subframe (i+4). For example, the eNode B 105 may vary a modulation and coding scheme (MCS) to use for uplink transmissions at subframe (i+4).
  • MCS modulation and coding scheme
  • transmit power for certain channels may be monitored during a first time period.
  • Transmit power may be attributed to other channels (e.g., PUCCH) to identify a second transmit power (a virtual transmit power), even when the channels associated with the virtual transmit power are substantially unused for transmission during the first time period.
  • a PHR may be a single PDU, which may contain a power headroom which accounts for transmit power associated with actual PUSCH transmission, and infers a transmit power for PUCCH (even though there in no PUCCH transmission for the relevant time period).
  • the eNode B 105 may receive the PHR for uplink transmissions from UE 110 , and provide an uplink allocation for each of the independently power controlled channels based on information from the PHR.
  • the uplink allocation for the channel associated with the virtual transmission may be varied over time to account for whether the channel associated with the virtual transmit power has a scheduled transmission.
  • FIG. 2 is a block diagram of a system 200 including an eNode B 105 - a and a UE 110 - a .
  • This system 200 may be the system 100 of FIG. 1 .
  • the eNode B 105 - a may be equipped with antennas 234 - a through 234 - x
  • the UE 110 - a may be equipped with antennas 252 - a through 252 - n .
  • a transmit processor 220 may receive data from a data source and control information from a processor 240 , memory 242 , and/or allocation module 244 .
  • the control information may be a grant with power allocations for PUCCH and PUSCH, scheduling transmission on uplink carriers for a particular UE 110 - a .
  • the control information may also be for the physical control format indicator channel (PCFICH), physical HARQ indicator channel (PHICH), physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), etc.
  • the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, and cell-specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the transmit modulators 232 - a through 232 - x .
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 232 - a through 232 - x may be transmitted via the antennas 234 - a through 234 - x , respectively.
  • the UE antennas 252 - a through 252 - n may receive the downlink signals from the eNode B 105 - a and may provide the received signals to the demodulators 254 - a through 254 - n , respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all the demodulators 254 - a through 254 - n , perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, providing decoded data for the UE 110 - a to a data output, and provide decoded control information to a processor 280 , memory 282 , or PHR module 284 (e.g., the processing allocation information to identify carriers and timing to be used for PUSCH and PUCCH transmission on the uplink).
  • a transmit processor 264 may receive and process data (e.g., for the PUSCH) from a data source and control information (e.g., for the PUCCH) from the processor 280 and PHR module 284 .
  • the transmit processor 264 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the demodulators 254 - a through 254 - n (e.g., for SC-FDMA, etc.), and be transmitted to the eNode B 105 - a .
  • the uplink signals from the UE 110 - a may be received by the antennas 234 , processed by the demodulators 232 , detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 110 - a .
  • the processor 238 may provide the decoded data to a data output and the decoded control information to the processor 240 and/or allocation module 244 .
  • the PHR module 284 of UE 110 - a may identify a virtual transmit power associated with an uplink control channel (e.g., PUCCH), and an actual transmit power for one or more uplink shared channels (e.g., PUSCH).
  • the virtual transmit power may be an uplink control channel offset, and be used when the uplink control channel is not transmitting.
  • the identified transmit powers (including the virtual transmit power) may be added together, and the power headroom available for the mobile device may be calculated using this information.
  • the UE 110 - a may transmit the PHR as control information to the eNode B 105 - a.
  • the present disclosure addresses issues with respect to power headroom reporting and the use of a virtual transmit power to account for PUCCH for a time period when no PUCCH transmissions are made.
  • Separate power headroom reports may be of value in many instances because power control operations on PUSCH and PUCCH can be run independently.
  • a variety of reporting formats may be used to reduce overhead; for example, it is not necessary to always include separate PUSCH and PUCCH reports (where PUCCH power headroom is computed using a fixed offset relative to PUSCH).
  • a single PDU tied to one of them may be used such as by setting a format-specific offset like the ⁇ _TF value used in LTE systems to zero or some other fixed value (e.g., when there are no PUCCH transmissions during a time period).
  • a virtual transmit power, or other fixed power offset may be used and configured by radio resource control (RRC) signaling.
  • RRC radio resource control
  • a single MAC PDU may be defined for use in certain circumstances, providing for a virtual PUCCH transmit power or fixed PUCCH/PUSCH power ratio which may reduce overhead (as opposed to a separate PHR for each, or a PUSCH only PHR).
  • FIG. 3 a simplified block diagram shows a PHR module 300 .
  • the PHR module 300 includes a measurement module 305 , power headroom calculation module 310 , and transmitter 315 .
  • the PHR module 300 may be the PHR module 284 of FIG. 2 . It may be integrated into the mobile device 110 of FIG. 1 or 2 .
  • the components of the PHR module 300 may, individually or collectively, be implemented with one or more Application Specific Integrated Circuits (ASICs) adapted to perform some or all of the applicable functions in hardware.
  • ASICs Application Specific Integrated Circuits
  • the functions may be performed by one or more other processing units (or cores), on one or more integrated circuits.
  • other types of integrated circuits may be used (e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), and other Semi-Custom ICs), which may be programmed in any manner known in the art.
  • the functions of each unit may also be implemented, in whole or in part, with instructions embodied in a memory, formatted to be executed by one or more general or application-specific processors.
  • the measurement module 305 may be configured to identify a transmit power associated with each of a number of independently power controlled channels of a mobile device. For example, the measurement module 305 may identify transmit power with reference to a power amplifier gain or other indication of transmit power for each independently power controlled channel.
  • one channel may be an uplink control channel, and one or more additional channels that are uplink shared channels.
  • the independently power controlled channels may be related to a single carrier or a plurality of carriers.
  • the identified transmit power of one channel (e.g., the uplink control channel) may be a virtual transmit power, while other identified transmit powers may be measured transmit powers for actual transmissions.
  • the power headroom calculation module 310 may be configured to accumulate the identified transmit powers (including the virtual transmit power), and calculate a power headroom available for the mobile device using the accumulated transmit powers.
  • the transmitter 315 may be configured to transmit a headroom report including the calculated power headroom available for the mobile device.
  • FIG. 4A is a block diagram of an alternative architecture for PHR device 400 .
  • the PHR device 400 includes a receiver 405 , a measurement module 305 - a , power headroom calculation module 310 - a , and transmitter 315 .
  • the measurement module 305 - a includes a PUSCH identification sub-module 410 and a PUCCH identification sub-module 415 .
  • the power headroom calculation module 310 - a includes an accumulator sub-module 420 , power headroom (PH) calculator sub-module 425 , and virtual accounting sub-module 430 .
  • the PHR device 400 may be an example of the PHR module 300 of FIG. 3 , or the PHR module 284 of FIG. 2 .
  • the PHR device 400 may be mobile device 110 of FIG. 1 or 2 , or may be a component thereof. For purposes of explanation the PHR device will be described with reference to LTE/A, while noting that principles described herein may be applied to
  • the receiver 405 may be configured to receive power control data and various scheduling information for PUSCH and PUCCH on one or multiple carriers, and forward this data to the measurement module 305 - a and/or the power headroom calculation module 310 - a .
  • the PUSCH identification sub-module 410 may determine a transmit power and carriers associated with PUSCH transmissions during a time period.
  • the PUCCH identification sub-module 415 may measure and/or identify a transmit power and carrier associated with PUCCH transmissions during the same time period.
  • the measurements and/or identifications may be forwarded to the power headroom calculation module 310 - a .
  • the virtual accounting sub-module 430 may associate a virtual transmit power with the PUCCH.
  • there may be a standard power offset used to account for PUCCH when there is no PUCCH transmission during a time period.
  • the accumulator sub-module 420 may add the virtual transmit power to the actual transmit powers for each of the PUSCH transmissions (e.g., for each of the uplink PUSCH carriers) for the time period.
  • the power headroom calculator sub-module 425 may use the calculations from the accumulator to determine the power headroom available for the mobile device (by, for example, comparing a maximum transmit power at the mobile device with the estimated transmit power (including the virtual transmit power). The power headroom calculator sub-module 425 may then put together a PHR identifying the headroom available. The transmitter 315 may transmit the PHR to an base station (e.g., eNode B 105 - a of FIG. 2 ).
  • an base station e.g., eNode B 105 - a of FIG. 2 .
  • a bar graph 450 is shown illustrating information that may be contained in a PHR at a UE (e.g., the UE 110 - a of FIG. 2 ) for a given time period.
  • a UE e.g., the UE 110 - a of FIG. 2
  • the transmit power used for PUSCH transmissions on carrier 1 ( 470 ) along with the transmit power used for PUSCH transmissions on carrier 2 ( 475 ) are used to illustrate an actual transmit power 465 from a UE but could include any number of independently power controlled channels on any number of uplink carriers.
  • a virtual transmit power 480 may be associated with PUCCH, and may be used to provide an estimated transmit power 460 for purposes of calculating power headroom 485 .
  • FIG. 5 a block diagram illustrates an allocation subsystem 500 .
  • This allocation subsystem 500 may be allocation module 244 of FIG. 2 , or integrated into the base station of FIG. 1 or 2 .
  • the allocation subsystem 500 includes a receiver 505 , allocation sub-module 510 , and transmitter 515 .
  • the allocation sub-module 510 may allocate resources on PUCCH and PUSCH.
  • PUCCH resources may be allocated in a semi-static manner.
  • the mobile device may be configured by higher layer messages for periodic CQI (channel quality information) reporting on PUCCH.
  • the allocation sub-module 510 may also dynamically allocate PUSCH resources.
  • the receiver 505 may receive a power headroom report (PHR) identifying a power headroom available for uplink transmissions from a mobile device.
  • PHR power headroom report
  • the PHR may identify an accumulated transmit power associated with each of a number of independently power controlled channels.
  • One or more of the transmit powers may be a virtual transmit power. This may be the PHR transmitted from the mobile device 110 to the base station 105 in FIG. 1 or 2 , the PHR generated by the PHR module 300 of FIG. 3 , or the PHR device 400 of FIG. 4 .
  • the allocation sub-module 510 may identify the transmit power (or virtual transmit power) associated with PUCCH using the PHR (and perhaps additional information), and may assess the power headroom available.
  • the allocation sub-module 510 may likewise identify the transmit power associated with PUSCH (on each of a number of channels) using the PHR (and perhaps additional information), and may assess the power headroom available.
  • the PHR may be single MAC PDU in some examples.
  • the allocation sub-module 510 may identify the grant and carrier to be used for PUCCH based on information from the PHR and determine an uplink allocation for each of the of independently power controlled channels (e.g., for the PUCCH and each PUSCH) taking into account information obtained from the PHR.
  • the transmitter 515 may then forward this scheduled allocation to the mobile device 110 of FIG. 1 or 2 , the PHR module 300 of FIG. 3 , or the PHR device 400 of FIG. 4 .
  • the allocation sub-module 510 may modify and update the grants.
  • FIG. 6 is a flow chart of a method 600 of power headroom calculation from a mobile device. The method may be performed, in whole or in part, by the mobile device 110 of FIG. 1 or 2 , the PHR module 284 of FIG. 2 , the PHR module 300 of FIG. 3 , or the PHR device 400 of FIG. 4 .
  • a transmit power associated with each of a number of independently power controlled channels is identified.
  • the independently power controlled channels may be associated with one or multiple uplink carriers configured for use by the mobile device.
  • the mobile device may be configured to concurrently transmit on one or more of the independently power controlled channels.
  • the identified transmit powers are accumulated.
  • a power headroom available for the mobile device is calculated using the accumulated transmit powers.
  • a PHR value may be expressed as an offset relative to a reference power and may include contributions which are dependent upon a specific transport format.
  • a virtual transmit power may be used to represent one or of the independently power controlled channels and may be determined by disregarding the transport format contribution.
  • a headroom report including the available power headroom calculations is transmitted.
  • FIG. 7 is a flow chart of a method 700 of power headroom calculation from a mobile device for uplink shared and control channels.
  • This method 700 may be an example of the method 600 of FIG. 6 .
  • the method 700 may be performed, in whole or in part, by the mobile device 110 of FIG. 1 or 2 , the PHR module 284 of FIG. 2 , the PHR module 300 of FIG. 3 , or the PHR device 400 of FIG. 4 .
  • a transmit power associated with one or more uplink shared channels of one or more carriers is identified.
  • a virtual transmit power associated with an uplink control channel is identified.
  • the identified transmit powers are accumulated.
  • a power headroom available for the mobile device is calculated using the accumulated transmit powers.
  • a headroom report is transmitted including the calculated power headroom available for the mobile device.
  • FIG. 8 is a flow chart of a method 800 of power headroom calculation from a mobile device for uplink shared and control channels on one or more carriers in an LTE system.
  • This method 800 may be an example of the method 600 of FIG. 6 .
  • the method 800 may be performed, in whole or in part, by the mobile device 110 of FIG. 1 or 2 , the PHR module 284 of FIG. 2 , the PHR module 300 of FIG. 3 , or the PHR device 400 of FIG. 4 .
  • a measured transmit power associated with one or more physical uplink shared channels on one or more carriers in an LTE/A system is identified, wherein there are shared channel transmission during a time period.
  • the LTE/A system may support multi-carrier operation in which a UE receives grants on a plurality of PUSCHs and/or in which the UE is permitted to transmit simultaneously on PUSCH and PUCCH.
  • a virtual transmit power associated with a physical uplink control channel in an LTE/A system is identified, wherein there is substantially no data transmitted on the control channel during the time period.
  • the identified transmit powers are accumulated (including the virtual transmit power).
  • a power headroom available for the UE is calculated using the accumulated transmit powers.
  • a headroom report is transmitted including the calculated power headroom available for the mobile device.
  • FIG. 9 is a flow chart of a method 900 for scheduling one or more uplink grants. This method 900 may be performed, in whole or in part, by the base station of FIG. 1 or 2 , the allocation module 244 of FIG. 2 , or the allocation subsystem 500 of FIG. 5 .
  • a headroom report identifying a power headroom available for uplink transmissions is received from a mobile device.
  • the power headroom report may identify an accumulated transmit power associated with each of a number of independently power controlled channels.
  • One or more of the transmit powers may be a virtual transmit power.
  • one or more uplink allocations are scheduled or otherwise allocated for transmission in relation to the independently power controlled channels as a group based on information obtained from the power headroom report.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal FDMA
  • SC-FDMA Single-Carrier FDMA
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc.
  • UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR).
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM).
  • GSM Global System for Mobile Communications
  • An OFDMA network may implement a radio technology such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM®, etc.
  • E-UTRA, E-UTRA, and GSM are part of Universal Mobile Telecommunication System (UMTS).
  • LTE Long Term Evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named “3rd Generation Partnership Project” (3GPP).
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • Information and signals may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • embodiments may be implemented by hardware, software, firmware, middleware, microcode, hardware description languages, or any combination thereof.
  • the program code or code segments to perform the necessary tasks may be stored in a computer-readable medium such as a storage medium.
  • Processors may perform the necessary tasks.
  • the various illustrative blocks and modules described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Throughout this disclosure the term “example” or “exemplary” indicates an example or instance and does not imply or require any preference for the noted example.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • any connection is properly termed a computer-readable medium.
  • Disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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EP11717810A EP2556705A1 (en) 2010-04-05 2011-04-05 Power headroom reporting
CN201180017360.7A CN102823307B (zh) 2010-04-05 2011-04-05 功率上升空间报告
PCT/US2011/031306 WO2011127097A1 (en) 2010-04-05 2011-04-05 Power headroom reporting
KR1020127029010A KR101573792B1 (ko) 2010-04-05 2011-04-05 전력 헤드룸 리포팅
JP2013503859A JP5507755B2 (ja) 2010-04-05 2011-04-05 電力ヘッドルーム報告
BR112012025180-5A BR112012025180B1 (pt) 2010-04-05 2011-04-05 Relatório de headroom de potência
TW100111868A TWI466565B (zh) 2010-04-05 2011-04-06 功率頂部空間報告

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WO2011127097A1 (en) 2011-10-13
JP2013527667A (ja) 2013-06-27
BR112012025180A2 (pt) 2016-06-21
TW201204123A (en) 2012-01-16
US20120082041A1 (en) 2012-04-05
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TWI466565B (zh) 2014-12-21
JP5507755B2 (ja) 2014-05-28

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